/* Interface between GDB and target environments, including files and processes Copyright 1990, 1991, 1992 Free Software Foundation, Inc. Contributed by Cygnus Support. Written by John Gilmore. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #if !defined (TARGET_H) #define TARGET_H /* This include file defines the interface between the main part of the debugger, and the part which is target-specific, or specific to the communications interface between us and the target. A TARGET is an interface between the debugger and a particular kind of file or process. Targets can be STACKED in STRATA, so that more than one target can potentially respond to a request. In particular, memory accesses will walk down the stack of targets until they find a target that is interested in handling that particular address. STRATA are artificial boundaries on the stack, within which particular kinds of targets live. Strata exist so that people don't get confused by pushing e.g. a process target and then a file target, and wondering why they can't see the current values of variables any more (the file target is handling them and they never get to the process target). So when you push a file target, it goes into the file stratum, which is always below the process stratum. */ #include "bfd.h" enum strata { dummy_stratum, /* The lowest of the low */ file_stratum, /* Executable files, etc */ core_stratum, /* Core dump files */ process_stratum /* Executing processes */ }; struct target_ops { char *to_shortname; /* Name this target type */ char *to_longname; /* Name for printing */ char *to_doc; /* Documentation. Does not include trailing newline, and starts with a one-line descrip- tion (probably similar to to_longname). */ void (*to_open) PARAMS ((char *, int)); void (*to_close) PARAMS ((int)); void (*to_attach) PARAMS ((char *, int)); void (*to_detach) PARAMS ((char *, int)); void (*to_resume) PARAMS ((int, int)); int (*to_wait) PARAMS ((int *)); void (*to_fetch_registers) PARAMS ((int)); void (*to_store_registers) PARAMS ((int)); void (*to_prepare_to_store) PARAMS ((void)); int (*to_xfer_memory) PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); void (*to_files_info) PARAMS ((struct target_ops *)); int (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *)); int (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *)); void (*to_terminal_init) PARAMS ((void)); void (*to_terminal_inferior) PARAMS ((void)); void (*to_terminal_ours_for_output) PARAMS ((void)); void (*to_terminal_ours) PARAMS ((void)); void (*to_terminal_info) PARAMS ((char *, int)); void (*to_kill) PARAMS ((void)); void (*to_load) PARAMS ((char *, int)); int (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *)); void (*to_create_inferior) PARAMS ((char *, char *, char **)); void (*to_mourn_inferior) PARAMS ((void)); enum strata to_stratum; struct target_ops *to_next; int to_has_all_memory; int to_has_memory; int to_has_stack; int to_has_registers; int to_has_execution; struct section_table *to_sections; struct section_table *to_sections_end; int to_magic; /* Need sub-structure for target machine related rather than comm related? */ }; /* Magic number for checking ops size. If a struct doesn't end with this number, somebody changed the declaration but didn't change all the places that initialize one. */ #define OPS_MAGIC 3840 /* The ops structure for our "current" target process. */ extern struct target_ops *current_target; /* Define easy words for doing these operations on our current target. */ #define target_shortname (current_target->to_shortname) #define target_longname (current_target->to_longname) /* The open routine takes the rest of the parameters from the command, and (if successful) pushes a new target onto the stack. Targets should supply this routine, if only to provide an error message. */ #define target_open(name, from_tty) \ (*current_target->to_open) (name, from_tty) /* Does whatever cleanup is required for a target that we are no longer going to be calling. Argument says whether we are quitting gdb and should not get hung in case of errors, or whether we want a clean termination even if it takes a while. This routine is automatically always called just before a routine is popped off the target stack. Closing file descriptors and freeing memory are typical things it should do. */ #define target_close(quitting) \ (*current_target->to_close) (quitting) /* Attaches to a process on the target side. */ #define target_attach(args, from_tty) \ (*current_target->to_attach) (args, from_tty) /* Takes a program previously attached to and detaches it. The program may resume execution (some targets do, some don't) and will no longer stop on signals, etc. We better not have left any breakpoints in the program or it'll die when it hits one. ARGS is arguments typed by the user (e.g. a signal to send the process). FROM_TTY says whether to be verbose or not. */ #define target_detach(args, from_tty) \ (*current_target->to_detach) (args, from_tty) /* Resume execution of the target process. STEP says whether to single-step or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given to the target, or zero for no signal. */ #define target_resume(step, siggnal) \ (*current_target->to_resume) (step, siggnal) /* Wait for inferior process to do something. Return pid of child, or -1 in case of error; store status through argument pointer STATUS. */ #define target_wait(status) \ (*current_target->to_wait) (status) /* Fetch register REGNO, or all regs if regno == -1. No result. */ #define target_fetch_registers(regno) \ (*current_target->to_fetch_registers) (regno) /* Store at least register REGNO, or all regs if REGNO == -1. It can store as many registers as it wants to, so the entire registers array must be valid. Result is 0 for success, -1 for problems. */ #define target_store_registers(regs) \ (*current_target->to_store_registers) (regs) /* Get ready to modify the registers array. On machines which store individual registers, this doesn't need to do anything. On machines which store all the registers in one fell swoop, this makes sure that REGISTERS contains all the registers from the program being debugged. */ #define target_prepare_to_store() \ (*current_target->to_prepare_to_store) () /* Reading and writing memory actually happens through a glue function which iterates across the various targets. Result is 0 for success, or an errno value. */ extern int target_read_string PARAMS ((CORE_ADDR, char *, int)); extern int target_read_memory PARAMS ((CORE_ADDR, char *, int)); extern int target_write_memory PARAMS ((CORE_ADDR, char *, int)); extern int xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); extern int child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); extern int target_xfer_memory PARAMS ((CORE_ADDR, char *, int, int)); /* From exec.c */ extern void print_section_info PARAMS ((struct target_ops *, bfd *)); /* Print a line about the current target. */ #define target_files_info() \ (*current_target->to_files_info) (current_target) /* Insert a breakpoint at address ADDR in the target machine. SAVE is a pointer to memory allocated for saving the target contents. It is guaranteed by the caller to be long enough to save "sizeof BREAKPOINT" bytes. Result is 0 for success, or an errno value. */ #define target_insert_breakpoint(addr, save) \ (*current_target->to_insert_breakpoint) (addr, save) /* Remove a breakpoint at address ADDR in the target machine. SAVE is a pointer to the same save area that was previously passed to target_insert_breakpoint. Result is 0 for success, or an errno value. */ #define target_remove_breakpoint(addr, save) \ (*current_target->to_remove_breakpoint) (addr, save) /* Initialize the terminal settings we record for the inferior, before we actually run the inferior. */ #define target_terminal_init() \ (*current_target->to_terminal_init) () /* Put the inferior's terminal settings into effect. This is preparation for starting or resuming the inferior. */ #define target_terminal_inferior() \ (*current_target->to_terminal_inferior) () /* Put some of our terminal settings into effect, enough to get proper results from our output, but do not change into or out of RAW mode so that no input is discarded. After doing this, either terminal_ours or terminal_inferior should be called to get back to a normal state of affairs. */ #define target_terminal_ours_for_output() \ (*current_target->to_terminal_ours_for_output) () /* Put our terminal settings into effect. First record the inferior's terminal settings so they can be restored properly later. */ #define target_terminal_ours() \ (*current_target->to_terminal_ours) () /* Print useful information about our terminal status, if such a thing exists. */ #define target_terminal_info(arg, from_tty) \ (*current_target->to_terminal_info) (arg, from_tty) /* Kill the inferior process. Make it go away. */ #define target_kill() \ (*current_target->to_kill) () /* Load an executable file into the target process. This is expected to not only bring new code into the target process, but also to update GDB's symbol tables to match. */ #define target_load(arg, from_tty) \ (*current_target->to_load) (arg, from_tty) /* Look up a symbol in the target's symbol table. NAME is the symbol name. ADDRP is a CORE_ADDR * pointing to where the value of the symbol should be returned. The result is 0 if successful, nonzero if the symbol does not exist in the target environment. This function should not call error() if communication with the target is interrupted, since it is called from symbol reading, but should return nonzero, possibly doing a complain(). */ #define target_lookup_symbol(name, addrp) \ (*current_target->to_lookup_symbol) (name, addrp) /* Start an inferior process and set inferior_pid to its pid. EXEC_FILE is the file to run. ALLARGS is a string containing the arguments to the program. ENV is the environment vector to pass. Errors reported with error(). On VxWorks and various standalone systems, we ignore exec_file. */ #define target_create_inferior(exec_file, args, env) \ (*current_target->to_create_inferior) (exec_file, args, env) /* The inferior process has died. Do what is right. */ #define target_mourn_inferior() \ (*current_target->to_mourn_inferior) () /* Pointer to next target in the chain, e.g. a core file and an exec file. */ #define target_next \ (current_target->to_next) /* Does the target include all of memory, or only part of it? This determines whether we look up the target chain for other parts of memory if this target can't satisfy a request. */ #define target_has_all_memory \ (current_target->to_has_all_memory) /* Does the target include memory? (Dummy targets don't.) */ #define target_has_memory \ (current_target->to_has_memory) /* Does the target have a stack? (Exec files don't, VxWorks doesn't, until we start a process.) */ #define target_has_stack \ (current_target->to_has_stack) /* Does the target have registers? (Exec files don't.) */ #define target_has_registers \ (current_target->to_has_registers) /* Does the target have execution? Can we make it jump (through hoops), or pop its stack a few times? */ #define target_has_execution \ (current_target->to_has_execution) /* Routines for maintenance of the target structures... add_target: Add a target to the list of all possible targets. push_target: Make this target the top of the stack of currently used targets, within its particular stratum of the stack. Result is 0 if now atop the stack, nonzero if not on top (maybe should warn user). unpush_target: Remove this from the stack of currently used targets, no matter where it is on the list. Returns 0 if no change, 1 if removed from stack. pop_target: Remove the top thing on the stack of current targets. */ extern void add_target PARAMS ((struct target_ops *)); extern int push_target PARAMS ((struct target_ops *)); extern int unpush_target PARAMS ((struct target_ops *)); extern void target_preopen PARAMS ((int)); extern void pop_target PARAMS ((void)); /* Struct section_table maps address ranges to file sections. It is mostly used with BFD files, but can be used without (e.g. for handling raw disks, or files not in formats handled by BFD). */ struct section_table { CORE_ADDR addr; /* Lowest address in section */ CORE_ADDR endaddr; /* 1+highest address in section */ sec_ptr sec_ptr; /* BFD section pointer */ bfd *bfd; /* BFD file pointer */ }; /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. Returns 0 if OK, 1 on error. */ extern int build_section_table PARAMS ((bfd *, struct section_table **, struct section_table **)); /* From mem-break.c */ extern int memory_remove_breakpoint PARAMS ((CORE_ADDR, char *)); extern int memory_insert_breakpoint PARAMS ((CORE_ADDR, char *)); /* From target.c */ void noprocess PARAMS ((void)); #endif /* !defined (TARGET_H) */